キャプチャーしない括弧 (?:)var match = "XABX".match(/(A|B|C)/); console.log(match); console.log(match[1]); [ 'A', 'A', index: 1, input: 'XABX', groups: undefined ] A
var match = "XAX".match(/(?:A|B|C)/); console.log(match); console.log(match[1]); [ 'A', index: 1, input: 'XAX', groups: undefined ] undefined
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